<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<meta name="generator" content="Hexo 5.4.0">
  <link rel="apple-touch-icon" sizes="180x180" href="/images/favicon.ico">
  <link rel="icon" type="image/png" sizes="32x32" href="/images/favicon.ico">
  <link rel="icon" type="image/png" sizes="16x16" href="/images/favicon.ico">
  <link rel="mask-icon" href="/images/favicon.ico" color="#222">

<link rel="stylesheet" href="/css/main.css">


<link rel="stylesheet" href="/lib/font-awesome/css/all.min.css">

<script id="hexo-configurations">
    var NexT = window.NexT || {};
    var CONFIG = {"hostname":"yoursite.com","root":"/","scheme":"Mist","version":"7.8.0","exturl":false,"sidebar":{"position":"left","display":"always","padding":18,"offset":12,"onmobile":false},"copycode":{"enable":false,"show_result":false,"style":null},"back2top":{"enable":true,"sidebar":false,"scrollpercent":false},"bookmark":{"enable":false,"color":"#222","save":"auto"},"fancybox":false,"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"algolia":{"hits":{"per_page":10},"labels":{"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}},"localsearch":{"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},"motion":{"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},"path":"search.xml"};
  </script>

  <meta name="description" content="Java反射">
<meta property="og:type" content="article">
<meta property="og:title" content="java反射">
<meta property="og:url" content="http://yoursite.com/2019/01/14/java-2019-1-14-JavaReflection/index.html">
<meta property="og:site_name" content="Akiyama&#39;s Blog">
<meta property="og:description" content="Java反射">
<meta property="og:locale" content="zh_CN">
<meta property="article:published_time" content="2019-01-13T16:00:00.000Z">
<meta property="article:modified_time" content="2021-05-16T10:05:00.316Z">
<meta property="article:author" content="丘山月夜">
<meta property="article:tag" content="Java">
<meta name="twitter:card" content="summary">

<link rel="canonical" href="http://yoursite.com/2019/01/14/java-2019-1-14-JavaReflection/">


<script id="page-configurations">
  // https://hexo.io/docs/variables.html
  CONFIG.page = {
    sidebar: "",
    isHome : false,
    isPost : true,
    lang   : 'zh-CN'
  };
</script>

  <title>java反射 | Akiyama's Blog</title>
  






  <noscript>
  <style>
  .use-motion .brand,
  .use-motion .menu-item,
  .sidebar-inner,
  .use-motion .post-block,
  .use-motion .pagination,
  .use-motion .comments,
  .use-motion .post-header,
  .use-motion .post-body,
  .use-motion .collection-header { opacity: initial; }

  .use-motion .site-title,
  .use-motion .site-subtitle {
    opacity: initial;
    top: initial;
  }

  .use-motion .logo-line-before i { left: initial; }
  .use-motion .logo-line-after i { right: initial; }
  </style>
</noscript>

</head>

<body itemscope itemtype="http://schema.org/WebPage">
  <div class="container use-motion">
    <div class="headband"></div>

    <header class="header" itemscope itemtype="http://schema.org/WPHeader">
      <div class="header-inner"><div class="site-brand-container">
  <div class="site-nav-toggle">
    <div class="toggle" aria-label="切换导航栏">
      <span class="toggle-line toggle-line-first"></span>
      <span class="toggle-line toggle-line-middle"></span>
      <span class="toggle-line toggle-line-last"></span>
    </div>
  </div>

  <div class="site-meta">

    <a href="/" class="brand" rel="start">
      <span class="logo-line-before"><i></i></span>
      <h1 class="site-title">Akiyama's Blog</h1>
      <span class="logo-line-after"><i></i></span>
    </a>
      <p class="site-subtitle" itemprop="description">丘山月夜的博客</p>
  </div>

  <div class="site-nav-right">
    <div class="toggle popup-trigger">
    </div>
  </div>
</div>




<nav class="site-nav">
  <ul id="menu" class="main-menu menu">
        <li class="menu-item menu-item-home">

    <a href="/" rel="section"><i class="home fa fa-home fa-fw"></i>首页</a>

  </li>
        <li class="menu-item menu-item-about">

    <a href="/about/" rel="section"><i class="user fa fa-user fa-fw"></i>关于</a>

  </li>
        <li class="menu-item menu-item-tags">

    <a href="/tags/" rel="section"><i class="tags fa fa-tags fa-fw"></i>标签</a>

  </li>
        <li class="menu-item menu-item-categories">

    <a href="/categories/" rel="section"><i class="th fa fa-th fa-fw"></i>分类</a>

  </li>
        <li class="menu-item menu-item-archives">

    <a href="/archives/" rel="section"><i class="archive fa fa-archive fa-fw"></i>归档</a>

  </li>
  </ul>
</nav>




</div>
    </header>

    
  <div class="back-to-top">
    <i class="fa fa-arrow-up"></i>
    <span>0%</span>
  </div>


    <main class="main">
      <div class="main-inner">
        <div class="content-wrap">
          

          <div class="content post posts-expand">
            

    
  
  
  <article itemscope itemtype="http://schema.org/Article" class="post-block" lang="zh-CN">
    <link itemprop="mainEntityOfPage" href="http://yoursite.com/2019/01/14/java-2019-1-14-JavaReflection/">

    <span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
      <meta itemprop="image" content="/images/avatar.png">
      <meta itemprop="name" content="丘山月夜">
      <meta itemprop="description" content="君は空を見てるか,<br>風の音を聞いてるか">
    </span>

    <span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
      <meta itemprop="name" content="Akiyama's Blog">
    </span>
      <header class="post-header">
        <h1 class="post-title" itemprop="name headline">
          java反射
        </h1>

        <div class="post-meta">
            <span class="post-meta-item">
              <span class="post-meta-item-icon">
                <i class="far fa-calendar"></i>
              </span>
              <span class="post-meta-item-text">发表于</span>

              <time title="创建时间：2019-01-14 00:00:00" itemprop="dateCreated datePublished" datetime="2019-01-14T00:00:00+08:00">2019-01-14</time>
            </span>
              <span class="post-meta-item">
                <span class="post-meta-item-icon">
                  <i class="far fa-calendar-check"></i>
                </span>
                <span class="post-meta-item-text">更新于</span>
                <time title="修改时间：2021-05-16 18:05:00" itemprop="dateModified" datetime="2021-05-16T18:05:00+08:00">2021-05-16</time>
              </span>
            <span class="post-meta-item">
              <span class="post-meta-item-icon">
                <i class="far fa-folder"></i>
              </span>
              <span class="post-meta-item-text">分类于</span>
                <span itemprop="about" itemscope itemtype="http://schema.org/Thing">
                  <a href="/" itemprop="url" rel="index"><span itemprop="name"></span></a>
                </span>
            </span>

          
            <div class="post-description">Java反射</div>

        </div>
      </header>

    
    
    
    <div class="post-body" itemprop="articleBody">

      
        <h1 id="1-反射介绍"><a href="#1-反射介绍" class="headerlink" title="1. 反射介绍"></a>1. 反射介绍</h1><p>1、在运行状态中，对于任意一个类，都能够知道这个类的属性和方法。</p>
<p>2、对于任意一个对象，都能够调用它的任何方法和属性。</p>
<p>这种动态获取信息以及动态调用对象的方法的功能称为JAVA的反射。</p>
<p>JAVA语言编译之后会生成一个.class文件，反射就是通过字节码文件找到某一个类、类中的方法以及属性等。</p>
<h1 id="2-反射的作用"><a href="#2-反射的作用" class="headerlink" title="2. 反射的作用"></a>2. 反射的作用</h1><p>在JAVA中，只有给定类的名字，就可以通过反射机制来获取类的所有信息，可以动态的创建对象和编译。</p>
<h1 id="3-反射的原理"><a href="#3-反射的原理" class="headerlink" title="3. 反射的原理"></a>3. 反射的原理</h1><p>首先明确的概念: 一切皆对象—-类也是对象.</p>
<p>其次明白加载: 当Animal.class在硬盘中时,是一个文件,当载入到内存中,可以认为是一个对象,是java.lang.class的对象.</p>
<p>类对象（字节码对象）：当JVM加载一个类时，会为这个类创建一个class对象。所有的类，都存在一个类对象，用于提供类本身的信息，比如有几种构造方法， 有多少属性，有哪些普通方法。</p>
<p>类的对象（实例化对象）：类的实例化</p>
<p>类中的内容包括：modifier  constructor  field  method.</p>
<p>反射的实现主要借助以下几个类：</p>
<p>Class：类的对象</p>
<p>Constructor：类的构造方法</p>
<p>Field：类中的属性对象</p>
<p>Method：类中的方法对象</p>
<p>Modifier</p>
<h1 id="4-代码实现"><a href="#4-代码实现" class="headerlink" title="4. 代码实现"></a>4. 代码实现</h1>
    </div>

    
    
    
        

  <div class="followme">
    <p>欢迎关注我的其它发布渠道</p>

    <div class="social-list">

        <div class="social-item">
          <a target="_blank" class="social-link" href="/images/wechat_channel.jpg">
            <span class="icon">
              <i class="fab fa-weixin"></i>
            </span>

            <span class="label">WeChat</span>
          </a>
        </div>
    </div>
  </div>


      <footer class="post-footer">
          
          <div class="post-tags">
              <a href="/" rel="tag"><i class="fa fa-tag"></i> </a>
          </div>

        


        
    <div class="post-nav">
      <div class="post-nav-item">
    <a href="/2019/01/14/tool-2019-1-14-Docker-Jenkins/" rel="prev" title="Docker for windows+Jenkins+gradle配置">
      <i class="fa fa-chevron-left"></i> Docker for windows+Jenkins+gradle配置
    </a></div>
      <div class="post-nav-item">
    <a href="/2019/02/14/android-2019-2-14-Review/" rel="next" title="面试复习知识点记录(更新中)">
      面试复习知识点记录(更新中) <i class="fa fa-chevron-right"></i>
    </a></div>
    </div>
      </footer>
    
  </article>
  
  
  



          </div>
          

<script>
  window.addEventListener('tabs:register', () => {
    let { activeClass } = CONFIG.comments;
    if (CONFIG.comments.storage) {
      activeClass = localStorage.getItem('comments_active') || activeClass;
    }
    if (activeClass) {
      let activeTab = document.querySelector(`a[href="#comment-${activeClass}"]`);
      if (activeTab) {
        activeTab.click();
      }
    }
  });
  if (CONFIG.comments.storage) {
    window.addEventListener('tabs:click', event => {
      if (!event.target.matches('.tabs-comment .tab-content .tab-pane')) return;
      let commentClass = event.target.classList[1];
      localStorage.setItem('comments_active', commentClass);
    });
  }
</script>

        </div>
          
  
  <div class="toggle sidebar-toggle">
    <span class="toggle-line toggle-line-first"></span>
    <span class="toggle-line toggle-line-middle"></span>
    <span class="toggle-line toggle-line-last"></span>
  </div>

  <aside class="sidebar">
    <div class="header-overlay"></div>
    <div class="sidebar-inner">

      <ul class="sidebar-nav motion-element">
        <li class="sidebar-nav-toc">
          文章目录
        </li>
        <li class="sidebar-nav-overview">
          站点概览
        </li>
      </ul>

      <!--noindex-->
      <div class="post-toc-wrap sidebar-panel">
          <div class="post-toc motion-element"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#1-%E5%8F%8D%E5%B0%84%E4%BB%8B%E7%BB%8D"><span class="nav-number">1.</span> <span class="nav-text">1. 反射介绍</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#2-%E5%8F%8D%E5%B0%84%E7%9A%84%E4%BD%9C%E7%94%A8"><span class="nav-number">2.</span> <span class="nav-text">2. 反射的作用</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#3-%E5%8F%8D%E5%B0%84%E7%9A%84%E5%8E%9F%E7%90%86"><span class="nav-number">3.</span> <span class="nav-text">3. 反射的原理</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#4-%E4%BB%A3%E7%A0%81%E5%AE%9E%E7%8E%B0"><span class="nav-number">4.</span> <span class="nav-text">4. 代码实现</span></a></li></ol></div>
      </div>
      <!--/noindex-->

      <div class="site-overview-wrap sidebar-panel">
        <div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
    <img class="site-author-image" itemprop="image" alt="丘山月夜"
      src="/images/avatar.png">
  <p class="site-author-name" itemprop="name">丘山月夜</p>
  <div class="site-description" itemprop="description">君は空を見てるか,<br>風の音を聞いてるか</div>
</div>
<div class="site-state-wrap motion-element">
  <nav class="site-state">
      <div class="site-state-item site-state-posts">
          <a href="/archives/">
        
          <span class="site-state-item-count">60</span>
          <span class="site-state-item-name">日志</span>
        </a>
      </div>
      <div class="site-state-item site-state-categories">
            <a href="/categories/">
          
        <span class="site-state-item-count">14</span>
        <span class="site-state-item-name">分类</span></a>
      </div>
      <div class="site-state-item site-state-tags">
            <a href="/tags/">
          
        <span class="site-state-item-count">21</span>
        <span class="site-state-item-name">标签</span></a>
      </div>
  </nav>
</div>



      </div>

    </div>
  </aside>
  <div id="sidebar-dimmer"></div>


      </div>
    </main>

    <footer class="footer">
      <div class="footer-inner">
        

        

<div class="copyright">
  
  &copy; 
  <span itemprop="copyrightYear">2021</span>
  <span class="with-love">
    <i class="fa fa-heart"></i>
  </span>
  <span class="author" itemprop="copyrightHolder">丘山月夜</span>
</div>
  <div class="powered-by">由 <a href="https://hexo.io/" class="theme-link" rel="noopener" target="_blank">Hexo</a> & <a href="https://mist.theme-next.org/" class="theme-link" rel="noopener" target="_blank">NexT.Mist</a> 强力驱动
  </div>

        








      </div>
    </footer>
  </div>

  
  <script src="/lib/anime.min.js"></script>
  <script src="/lib/velocity/velocity.min.js"></script>
  <script src="/lib/velocity/velocity.ui.min.js"></script>

<script src="/js/utils.js"></script>

<script src="/js/motion.js"></script>


<script src="/js/schemes/muse.js"></script>


<script src="/js/next-boot.js"></script>




  















  

  

</body>
</html>
